Field of View/Focal Length Conversion Table
While working on some architectural models recently I realized that it would be very helpful to set the camera's field of view to specific focal lengths for renderings. For me it's just more natural to think in terms of 35mm focal lengths instead of a field of view angle. So I put together this table in Excel and thought some others might find it useful as well.
Here's the formula I used: a = 2arctan * d/2f
... where a = angle; d = dimension and f = effective focal length.
In Excel, using the horizontal dimension of a traditional 35mm frame, this becomes:
a = 2*degrees(atan(36/(2*f)))
... where f = the cell reference containing the focal length number.
There is an interesting discussion of this on Wikipedia. (That's where I found the formula.)
I can upload the Excel spreadsheet, too, if anyone would like to play around with it.
Steve
While working on some architectural models recently I realized that it would be very helpful to set the camera's field of view to specific focal lengths for renderings. For me it's just more natural to think in terms of 35mm focal lengths instead of a field of view angle. So I put together this table in Excel and thought some others might find it useful as well.
Here's the formula I used: a = 2arctan * d/2f
... where a = angle; d = dimension and f = effective focal length.
In Excel, using the horizontal dimension of a traditional 35mm frame, this becomes:
a = 2*degrees(atan(36/(2*f)))
... where f = the cell reference containing the focal length number.
There is an interesting discussion of this on Wikipedia. (That's where I found the formula.)
I can upload the Excel spreadsheet, too, if anyone would like to play around with it.
Steve
